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Lithium ion battery and anode thereof

A lithium-ion battery, cathode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor high temperature and rate performance, improve electrical conductivity, excellent high temperature performance and rate performance, and solve capacity and cycle performance. the effect of decay

Inactive Publication Date: 2012-10-03
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thereby overcoming the shortcomings of high temperature and poor rate performance of batteries using lithium iron phosphate as the positive electrode active material in the prior art

Method used

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  • Lithium ion battery and anode thereof
  • Lithium ion battery and anode thereof
  • Lithium ion battery and anode thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Weigh 100g of 4A molecular sieve (the particles can pass through 150 mesh sieve) and add it to 300mL LiCl ethanol solution with a concentration of 2mol / L. Keep the container closed, magnetically stir at room temperature for 48h, filter, and clean the filtrate with ethanol , The white powder obtained was dried in a vacuum drying oven at 80°C for 2 hours, and then placed in a vacuum drying oven at 180°C for constant temperature vacuum roasting for 1.5 hours, and finally the obtained powder was activated under reduced pressure and vacuum at 300°C for 2 hours. That is, a lithiation molecular sieve with a lithiation number of 1 time is prepared. Take a small amount of powder and test its lithium content by ICP (Inductively Coupled Plasma).

[0029] Combine lithium iron phosphate, adhesive polyvinylidene fluoride (PVDF), conductive carbon and the above-mentioned lithiated molecular sieve in a mass ratio of 91:2:2:5 (that is, the mass ratio of lithiated molecular siev...

Embodiment 2

[0031] Example 2: The difference from Example 1 is: Weigh 100 g of 3A molecular sieve (the particles can pass through a 200-mesh mesh sieve) and add it to 300 mL of LiNO with a concentration of 1.5 mol / L 3 In the ethanol solution, the container is kept airtight, magnetically stirred at room temperature for 24 hours, filtered, and the filtrate is washed with ethanol. The white powder obtained is dried in a vacuum drying oven at 90°C for 2 hours, and then placed in a vacuum drying oven at 150°C Vacuum roasting at a constant temperature for 1h, and then add the molecular sieve obtained to the above 1.5mol / L LiNO after cooling 3 In the ethanol solution, repeat the above-mentioned stirring, filtering, clearing, drying, roasting and other processes once, and finally the obtained powder is activated under reduced pressure and vacuum at 350℃ for 2.5h, that is, the lithiation with 2 lithiation times is prepared. Molecular sieve. Take a small amount of powder and test its lithium content...

Embodiment 3

[0034] Example 3: The difference from Example 1 is: Weigh 100g of 3A molecular sieve (the particles can pass through a 180 mesh sieve) and add it to 300mL LiClO with a concentration of 1mol / L 4 In the ethanol solution, the container is kept airtight, magnetically stirred at room temperature for 30 hours, filtered, and the filtrate is washed with ethanol. The white powder obtained is dried in a vacuum drying oven at 85°C for 1 hour, and then placed in a vacuum drying oven at 170°C Vacuum roasting at constant temperature for 2h, after cooling, add the obtained molecular sieve to the above 1mol / L LiClO 4 In the ethanol solution, repeat the above-mentioned stirring, filtering, clearing, drying, roasting and other processes twice, and finally the obtained powder is activated under reduced pressure and vacuum at 370℃ for 3h, that is, the lithiation with 3 lithiation times is prepared. Molecular sieve. Take a small amount of powder and test its lithium content by ICP test.

[0035] The...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to an anode of a lithium ion battery. The anode comprises a current collector and an anode diaphragm arranged on the current collector, wherein the anode diaphragm comprises an anode active substance, a bonding agent and a conductive additive, the anode active substance comprises lithium iron phosphate, the anode diaphragm further comprises a lithiation molecular sieve which accounts for 0.1-10wt% relative to the total mass of the anode diaphragm. Compared with the prior art, the invention has the advantages that by addition of the lithiation molecular sieve in the anode, on one hand, the occurrence of side effects between electrolyte and trace moisture in a battery can be reduced effectively, the production of HF is reduced, the dissolution of ion elements in a cyclic process is reduced, and the cyclic stability of a material is increased; and one the other hand, the molecular cage structure of the lithiation molecular sieve provides lithium ion migration channels, so that the electric conduction of lithium ions is increased, and the high temperature performance and the multiplying performance of the lithium ion battery are increased favorably. In addition, the invention further provides the lithium ion battery comprising the anode.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery and its positive electrode capable of improving the high temperature performance and rate performance of the lithium ion battery with lithium iron phosphate as the main positive electrode material. Background technique [0002] With the rise of the low-carbon economy, lithium-ion batteries are also actively developing in the direction of power vehicles and grid energy storage. The development of lithium-ion batteries that can be quickly charged and discharged and suitable for the harsh use conditions of power vehicles has become the focus of research . Lithium-ion battery cathode material is the bottleneck that determines the development of lithium-ion batteries, and it is the determinant of the performance and price of lithium-ion batteries. Therefore, the research and development of high-performance cathode materials for lithium-...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/62H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 郎野
Owner NINGDE AMPEREX TECH
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